REFERENCES
- Appleton (EV) Proc. Roy. Soc. A162, 1937; 451.
- Letfus (V). Apostolov (EM) and Nestorov (G). Jour. Atm. Terr. Phy. 35, 1973; 571.
- Mitra (SN) and Mazumdar (SC). Jour. Atm. Terr. Phys. 10, 1957; 32.
- Mitra (SN). Jour. Instn. Tel. Engrs. 5, 1959; 121.
- Mitra (SN). Jour. Atm. Terr. Phy. 26, 1964; 375.
- Mitra (SN). Solar Physics. 15, 1970; 249.
- Mitra (SN). Jour. Instn. Electron. Tel. Engrs. 20, 1974; 141.
- Rao (MK). D. Phil. Thesis. 1964.